METRIBUZIN

Chemical Identification
Chemical Identification
CAS # 21087-64-9
Formula
 

C₈H₁₄N₄OS

Synonyms
 

4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one

Physical Properties
Physical Properties
Physical description Colorless, crystalline solid.
Boiling point Molecular weight 214.3
Freezing point/melting point 257°F Vapor pressure 0.0000004 mmHg
Flash point Vapor density
Specific gravity 1.31 Ionization potential
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) A175
Sampling group
Sampler/Sampling media OSHA versatile sampler (OVS-2) - 13 mm XAD-2 tube (270/140 mg) with GFF enclosed [SKC 226-30-16]
Sampling time*
Sampling volume (TWA)*

240 L

Sampling flow rate (TWA)*

1 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-FPD
Method reference OSHA PV2044 (partially validated)
Notes
 

 

Special requirements
 

 

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
 

 

Bulk Method
Bulk Method
 

 

On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA
 

 

REL-TWA
 

5 mg/m³

TLV-TWA
 

5 mg/m³ [1981]

PEL-TWA
 
 

5 mg/m³

PEL-STEL
 

 

REL-STEL
 

 

TLV-STEL
 

 

PEL-STEL
 
 

 

PEL-C
 

 

REL-C
 

 

TLV-C
 

 

PEL-C
 
 

 

Skin notation
 

N

Skin notation
 

N

Skin notation
 

N

Skin notation
 
 

N

Notes:
 

Not established

Notes:
 

 

Notes:
 

 

Notes:
 
 

 

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: TLV-A4, EPA-D Notes:
 
 

 

AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
 
 

 

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Metribuzin

NIOSH: Pocket Guide to Chemical Hazards - Metribuzin

Literature References

 
 
  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Metribuzin. See annual publication for most recent information.

Last Updated Date : 01/05/2021